Vtamin D has various uses. It may be used in definate Vitamin D deficiency states. It may be used in Osteoporosis, heart disease, HIV & AIDS, TB, Cancer prevention, protection against diseases such as MS, Arthritis and other autoimmune diseases as well. This dose of 1000IU daily is what we consider to be the "new-aspirin" - it should be taken daily. PLEASE VISIT THE WEBSITE BELOW.